Add 20-24 carrot cake Oreos to a food processor. Pulse a few times until all the cookies are crushed.
Add 1 1/4 cup of milk and mix well until a smooth consistency is formed. Add the Oreo mixture to a microwave-safe cake mold and cook on high for 5 minutes. Take the cake out and let it cool.
In a mixing bowl or food processor, combine 3 cups of powdered sugar, 1/2 cup of room temperature butter, 8 ounces of room temperature cream cheese, 1 tablespoon of pumpkin spice, and a teaspoon of vanilla.
When the cake has cooled, add the pumpkin spice cream cheese frosting and enjoy!